Clean Truck Check Credentialed Tester

Clean Truck Check in Northwood, IA

1 credentialed tester in Northwood.

Testers in Northwood

Nearest in-person tester to Northwood

The closest CARB-credentialed Clean Truck Check tester is QSC in Des Moines, Iowa — about 125 miles away (straight-line). Smart CTC tests over the truck’s OBD port from anywhere, with no drive and no appointment.

Trucking activity in Worth County

Clean Truck Check applies to heavy-duty vehicles that operate in California — including out-of-state trucks based here that run loads west.

Trucking establishments
6
Trucking employees
21

Source: FMCSA MCMIS carrier census, US Census County Business Patterns 2021.

Freight corridors near Northwood

Northwood sits on I-35, I-35-ALT, I-35-BUS, I-35-Business, I-90 and US-218. Trucks running these routes into California fall under CARB’s Clean Truck Check — Smart CTC lets them test remotely without leaving the road.

Source: OpenStreetMap (© OpenStreetMap contributors).

Nearby truck stops

OpenStreetMap-tagged truck stops, services areas, and HGV-marked fuel stations within 25 miles of Northwood. Useful for routing a service stop around your CTC test.

+2 more within 25 miles.

Source: © OpenStreetMap contributors. Last updated 2026-05-27.